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參數資料
| 型號： | ADF7020BCP |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | High Performance ISM Band FSK/ASK Transceiver IC |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, QCC48 |
| 封裝： | 7 X 7 MM, LFCSP-48 |
| 文件頁數： | 21/40頁 |
| 文件大小： | 797K |
| 代理商： | ADF7020BCP |
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Preliminary Technical Data
ADF7020
APPLICATIONS SECTION
LNA/PA MATCHING
The ADF7020 exhibits optimum performance in terms of
sensitivity, transmit power, and current consumption only if its
RF input and output ports are properly matched to the antenna
impedance. For cost-sensitive applications, the ADF7020 is
equipped with an internal Rx/Tx switch, which facilitates the
use of a simple combined passive PA/LNA matching network.
Alternatively, an external Rx/Tx switch such as the Analog
Devices ADG919 can be used, which yields a slightly improved
receiver sensitivity and lower transmitter power consumption.
External Rx/Tx Switch
Figure 18 shows a configuration using an external Rx/Tx switch.
This configuration allows an independent optimization of the
matching and filter network in the transmit and receive path,
and is, therefore, more flexible and less difficult to design than
the configuration using the internal Rx/Tx switch. The PA is
biased through inductor L1, while C1 blocks dc current. Both
elements, L1 and C1, also form the matching network, which
transforms the source impedance into the optimum PA load
impedance, Z
OPT
_PA.
Rev. PrH | Page 21 of 40
0
PA
LNA
PA_OUT
RFIN
RFINB
V
BAT
L1
ADF7020
ADG919
OPTIONAL
BPF
(SAW)
OPTIONAL
LPF
L
A
C
A
C
B
Z
IN
_RFIN
Z
OPT
_PA
Z
IN
_RFIN
ANTENNA
Rx/Tx – SELECT
Figure 18. ADF7020 with External Rx/Tx Switch
Z
OPT
_PA depends on various factors such as the required output
power, the frequency range, the supply voltage range, and the
temperature range. Selecting an appropriate Z
OPT
_PA helps to
minimize the Tx current consumption in the application. This
datasheet contains a number of Z
OPT
_PA values for representa-
tive conditions. Under certain conditions, however, it is
recommended to obtain a suitable Z
OPT
_PA value by means of a
load-pull measurement.
Due to the differential LNA input, the LNA matching network
must be designed to provide both a single-ended to differential
conversion and a complex conjugate impedance match. The
network with the lowest component count that can satisfy these
requirements is the configuration shown in Figure 18, which
consists of two capacitors and one inductor. A first-order
implementation of the matching network can be obtained by
understanding the arrangement as two L-type matching
networks in a back-to-back configuration. Due to the
asymmetry of the network with respect to ground, a compro-
mise between the input reflection coefficient and the maximum
differential signal swing at the LNA input must be established.
The use of appropriate CAD software is strongly recommended
for this optimization.
Depending on the antenna configuration, the user might need a
harmonic filter at the PA output to satisfy the spurious emission
requirement of the applicable government regulations. The
harmonic filter can be implemented in various ways, such as a
discrete LC-filter. Dielectric low-pass filter components such as
the LFL18924MTC1A052 (for operation in the 915 MHz band),
or LFL18869MTC2A160 (for operation in the 868 MHz band),
both by Murata Mfg. Co., Ltd., represent an attractive alternative
to discrete designs. The immunity of the ADF7020 to strong
out-of-band interference can be improved by adding a band-
pass filter in the Rx path. Apart from discrete designs, SAW or
dielectric filter components such as the
SAFCH869MAM0T00B0S, SAFCH915MAL0N00B0S,
DCFB2869MLEJAA-TT1, or DCFB3915MLDJAA-TT1, all by
Murata Mfg. Co., Ltd., are well suited for this purpose.
Internal Rx/Tx Switch
Figure 19 shows the ADF7020 in a configuration where the
internal Rx/Tx switch is used with a combined LNA/PA
matching network. Depending on the application, the slight
performance degradation caused by the internal Rx/Tx switch
might be acceptable, allowing the user to take advantage of the
cost-saving potential of this solution. The design of the
combined matching network must compensate for the
reactance presented by the networks in the Tx and the Rx paths,
taking the state of the Rx/Tx switch into consideration.
0
PA
LNA
PA_OUT
RFIN
RFINB
V
BAT
L1
ADF7020
OPTIONAL
BPF OR LPF
L
A
C
A
C1
C
B
Z
IN
_RFIN
Z
OPT
_PA
Z
IN
_RFIN
ANTENNA
Figure 19. ADF7020 with Internal Rx/Tx Switch
The procedure typically requires several iterations until an
acceptable compromise has been reached. The successful
implementation of a combined LNA/PA matching network for
the ADF7020 is critically dependent on the availability of an
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| ADF7020BCPZ | 功能描述:IC TX FSK/ASK ISM BAND 48LFCSP RoHS:是 類別:RF/IF 和 RFID >> RF 收發器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:30 系列:- 頻率:4.9GHz ~ 5.9GHz 數據傳輸率 - 最大:54Mbps 調制或協議:* 應用:* 功率 - 輸出:-3dBm 靈敏度:- 電源電壓:2.7 V ~ 3.6 V 電流 - 接收:* 電流 - 傳輸:* 數據接口:PCB，表面貼裝 存儲容量:- 天線連接器:PCB，表面貼裝 工作溫度:-25°C ~ 85°C 封裝/外殼:68-TQFN 裸露焊盤 包裝:管件 |
| ADF7020BCPZ-RL | 功能描述:IC TX FSK/ASK ISM BAND 48LFCSP RoHS:是 類別:RF/IF 和 RFID >> RF 收發器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:30 系列:- 頻率:4.9GHz ~ 5.9GHz 數據傳輸率 - 最大:54Mbps 調制或協議:* 應用:* 功率 - 輸出:-3dBm 靈敏度:- 電源電壓:2.7 V ~ 3.6 V 電流 - 接收:* 電流 - 傳輸:* 數據接口:PCB，表面貼裝 存儲容量:- 天線連接器:PCB，表面貼裝 工作溫度:-25°C ~ 85°C 封裝/外殼:68-TQFN 裸露焊盤 包裝:管件 |
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